I had the same question a while ago. I believe there is a machine that crinkles the paper......but I don't know if there is a crinkler AND a cutter. So in the end, I just bought it, but jeepers, it's not cheap if you want different colors.

Now for the crazy confession. One time I shredded pink paper, took it out of the shredder...and piece by piece folded and folded and folded to make my own crinkles. I am somewhat determined and want what I want.